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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4aaf4c5d3011edb7fd065235bbe2700dd2c046a3f7fbe879a32b05528747416' 
  AND token = 'iWg70qLP0ZV0ISWVt3jaqZq0epv+vp3dM++2WSsUVhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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