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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecee0eec16d8eeaf5b78f48a3dac625120d311813ca32ca02666a8cc5564a6f' 
  AND token = 'l9PbeIhvKtH8oj53Pvl9xqFqn3Wrls4CFoav+MkiE0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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