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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d7262012886edae78d6741c264e48f49ab82a9b56020458f93c7057a772f5d' 
  AND token = 'Q8q+o850YCWDFg0dP1Vv5k6+3fS2L/hR0ho8TS05WTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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