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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b761945607e04292370d7754123e28a882f36ab8294e98c0b51712427f5bde' 
  AND token = 'eWWr3QBNPsqkx2VorYhM9KSrK8bodi1AnE7W9W4GwHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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