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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f5400e2a6f738f0b1d89222108f4b01f79a7160a970692157f5a839b8c308b' 
  AND token = 'lXVNX5EM7Xkz9rTwvxZm3ErcByZLFXRwJzdt5F7z0UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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