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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251ba55346f0366701da243bec30f6dc7ed6ebc4353e2b1fb607d707fbc919fb' 
  AND token = '6E6ZY8/UC79vjICMBM9IFaU7Ays3cAc+hXVAAEFxlJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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