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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043e7b8524fae9329a73c0637adf3456b1eafb845f969c040363fc2cab04d5d6' 
  AND token = '/slMY5ZfdCoI00emobmxbupdDZ2AGaAo/Bk+A3liE6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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