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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1003299b4bb7b0944df53e93cd61e1dddc5eee53515f3d4b4a7c51cfad7d24' 
  AND token = 't3kOEOG6BDwdifIdmm+hm0X5KBT31fXtpfojHCrgHEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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