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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0340661c7dd9b59b5029a941cb3d6c28cf29f88d046380f335b1b089ab105688' 
  AND token = '3mrQ9Yte8q6acnCYk6si9uR9+x9TlSDKY8XcJQB4+J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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