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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5e9c63dbec81f8c6639eef2c6f52df8b40de0dcae59c448a451b6590d30bb9' 
  AND token = '02wN5cmgRw5q6VXuUyI9IiDUKJP+eavK1i6Mskzg7oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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