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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e0c8f23c70c6b080d16cbd2acf0e861e1503a2145cdccd3d6bf945d99a36a9' 
  AND token = 'eYgXdkOkeczLp2ATIOfpHUVGFLbsdqO7BDA/2XJzLuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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