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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88423c3c2f1ac73929381a48384ef72943f6d2ab20be0c76c1b5f4d60559756f' 
  AND token = 'f4m/113k+UkPX9PFMJn4lil7y5lbO9kauOPSPMMEJew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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