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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9575b3f008ebaedc55491cf52218cfdaf91808ca40266d0d336855938af104a' 
  AND token = '8eY80UZlPb3sL+a/sSQMQmvvsehkyqLns3EHsJnYNTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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