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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4a3ef541d91910be8744a2ee13925a362c25bbbc168b1e4dcbb2f60c7ce6bd' 
  AND token = '0AZfe+TZj2hM08Y9icEXc+HctsPLr1PK9v3sWkuoGhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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