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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c6bbe7dc9d6d0ce6dd31300fe4905009d5ef24239e6a5085a2f1aed5218c0a' 
  AND token = 'LEdOrOXCX52pv6g0WVpHR++LPdIuF08PRB7uSDskK+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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