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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080f7057498b1dedadb1212449bd814c463d35aa94cae58f6540f0575aecc6ba' 
  AND token = 'Db8tzCGFdXkFxENMNmRN8eHwaLlw9Ufa7FGuoiQILWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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