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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30aa6c2a069c49c3d67eb180b07d020969cd9b31ee65f42384df9cc118bcc67' 
  AND token = 'eyuH8IaEzTrIN+/8GzCPBw2SPsK2NkExk+hdypysgQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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