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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e7d770c33d43d28232dab6614a0923d960e2649df3cafe485551319608aa07' 
  AND token = 'ukWxOESUfwfaMQ/DEfOr4igWWBzOvtdil7UfN7gQ+0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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