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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105f5323e4c7615cfa7cf3c2ba4745db7130eb3d12c5d04bdc2d7f9622146522' 
  AND token = '0jMMUl2916VnmEhlZ6pelGgnO0vetH3ZB8LUxsc2YX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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