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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc71c394a048f6b38392591ba5a3fb7d1e3c43637dc0d8b12ae028b56b45cad3' 
  AND token = 'VvfvI4/QFAOkrkj9lk4OSEXV7JliAwx17fEet5m77Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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