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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e944a2b5c25d0bedc0c74283b7f70019c545c7aca45ae7dd45b87dfc5f93ae' 
  AND token = '+83KsEXLSMiIfLGaHYYLvHng3btY7tHX5RybqrPwAgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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