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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a1e63d9469bf6ac00201aeb253fe719ffa86096f916d0afa2aa09dbf64d493' 
  AND token = '/2ElmiNW1xIhh9YW51ScVE5WdW+KfUxoRYGM/TolbYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}