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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd2917295295f66c435d82bc1f64606280b010045406940d472ca77764ed870' 
  AND token = 'b9QTF4eDqz/N52eZzR4PRVX5bO8QJucouo+WjCvX5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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