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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e36d23b23bb502eb80be78abc8695fa9505f143c13b24d0cd8551f298b9e64a' 
  AND token = 'tpjC7P34txO6TBLi9Rnn3+TsqnTvg6G9PlA2ecIxo0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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