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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3835c99483aa5664362c12d49c05fcc38aa5890c82dfe4173fd1c35b1f99c5' 
  AND token = 'Fsp3aMK2bm8+NGDrV1H5xaYUeJNb0IoPpBgd2X8o5xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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