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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1010d83337ae8e140966b4a353b3e4f9b28e86d51956f84c96dc699fc08343' 
  AND token = 'S3AQ0fL66ewSU2OasDzg/ab6QDh7OGorH8Ai5TKU34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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