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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d082c6d590e9eb08521004a97b41a44e68ea1965a8cc7625d370c75de1a6bbb' 
  AND token = '/GLOqCEF/R2TCU5WunNKqlRsWSxpsGFc06uefLl20nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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