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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ef8a94631b9e9ba6370af44ebf6578ae891fdea25900b0b23f3980eea29189' 
  AND token = 'Y5qbmK3JxcUZCJhsZn3bNWsqzst0GO8eX9jPCUYxVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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