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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40720b530635e89807a6078ecf841be0d39014e29520d1bd5539af95d5c9139b' 
  AND token = 'oDINI+rNir5uCdfzlNI/Sy0JOclbgO6QPJwuhgHI6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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