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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49560cf9fd9acaf6df6586e7aa4f9ffbfe9271bf9b12e283a8d6cebb8a8b5bd9' 
  AND token = 'TAbUOYpPhvmasU4aVRoFk4G8ms2imzozseEaSTf+WTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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