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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862c5bf8c4182675665ee297ab0063a663d0923b9e30e50881eeafb2b83e1429' 
  AND token = '/xcDclESVSmQnFlWAwUD3kGcjp19YA/4qlOe3Mx/xi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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