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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abdcdc67121803ab14b52df3de57d3028be676d063335db6408a9009d619a09' 
  AND token = 'deFJ3yg/gIfqbrtKePoYmKW7/Tk0OSIT7LR/egVQQNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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