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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e48a6f4051d7a8fd720e66686d0309dfc505c1817a88f0c0a59b6053b83032b' 
  AND token = '6ORS8zDvuAvHsuwIrMHopa6fKIXXx9SvxZLGje+LKFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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