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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba20d6f7cfe041648ce219bb101e97cc6eaa0ebf0eb726764cee3fd0c0cb4be6' 
  AND token = 'xKrNDBMDi2mzITLLZilC60Kq9Px5joSF5EdbhVm1cz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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