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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882025bc1e754d984d15d6d68cca61a12d04fc6aa5818abe7a29d050b79595ba' 
  AND token = 'AOMBwId2HS7yoG8vPGEvVxtpsLO9uVK+JUrF2KyQxY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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