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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351b7486dfd0f77837c4b9531cc81d5f6041578e75ada3c0b0a69cd74f9fefad' 
  AND token = 'VdSNlHMncAo5JhMlM3zJ7FcNkYG5qlOXFetr645U9v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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