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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fb1eb2852117254490f1ac2c7f6aac10115aa18a5b19ddf5a359e1d9529d88' 
  AND token = 'sx4MDJ7rScC0oCM+12BFlexDiVq0NnrNdRw9274KSfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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