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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbf05369864a454f9137b546a44a454d9ad31f53479402ac94be2fc174d3b68' 
  AND token = 'sD5VUKNxq3GCBmdL5XiDOdXvTUaC7e7Xd/9dPX7aRFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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