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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7d30cc3fcdd3c488701d274b1bdf5a127b69a1b289deec7b6e704e30517fa3' 
  AND token = 'efAr5P/9bSWYsZh5uWdXw71ZkU9ZLS2R4tuQM+/QXjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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