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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f0d5d18781d8078db5da4d923bc0a47f1428cba58d1e050b9e471a4520c3ba' 
  AND token = 'QXPcQxK6kbCpCyXqgZUUzD0PEHtXrM3JpV/16F6mj0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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