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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1b27193d60b4cc27b2ee2fde1ab8dd66ab1a5ec451c25b2a7be7acda21ee97' 
  AND token = '0hnUKWAZEa/HFN7zoAgtcKQXsukEQpgPeqNnG1DkfwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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