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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eee800a4678434061b14c0ce344a13433e4dd89cda1d0b8e03d7bc2989002d9' 
  AND token = 'eIXnpl9moWtNbF3sl2jOCFBx6u8fOU3Vf7fibM34xKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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