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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5b56913b37252f1abbc0421664438325988f5d76845c593cfaa6552af94e13' 
  AND token = 'TO6T5zHPxgE2mc3DRjU8XXKrQ9NWNqTAe5gIjlQbGz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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