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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea15a2c4fe680b5afb4b8e52f93d76bb9508f3013f47be772177219b9a8a1c53' 
  AND token = 'nG11fOCslb19pKuJqV/P71MA8NZfMFZqi64PHx5Ptjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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