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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad3726541517f266ac2eda14e6ee14f837be21662b34998a626a10e1507a15' 
  AND token = 'N0b9Ihntjpip0q5LJ22uvyaiFWZDBeZYtj62Y3O0aQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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