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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af056669960c98359df32944aad9f4225a8790d36bd96e311d6e21ce5f2a99d6' 
  AND token = 'Oz26enupzr0UxMd9dLcX9dT+gvpVtNnFowo8f8H3qHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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