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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce8a11ffdec25a32c53a035c9a0d14595039a4dc2ec81ed0c9e6de1f9beeef6' 
  AND token = 'ducmfXwCzXnBMQ3dfS/+XRMUTWJD7QuYMLA6SPhiFqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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