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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3c97f6624a7eabf8bfa866a29da13f3cd557ac0f4115b0784822f62b76573d' 
  AND token = 'wE4mYtnc+k5oXud57METbadaKk2QfHqkbbrJ5gawHWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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