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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afef06001748bc473239d98cb371c9e5787a79c33d1076d0440f9ec314248e8' 
  AND token = '5ZC8rKxhggjxIn0K85qNIoXu3it8s2+eYEhEFXFjr1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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