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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2339053e52ac9145fb9d537add7dc2e759b6abbe5739a2ca23d3786e8974659' 
  AND token = '/bHT2B/u11P0255W9xJ4AryFROsbl9f5Bp5iV7AKTOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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