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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716f44383dce9077263b8a2cc1f446047779bad85d1cf090dfbfbe274dc7361c' 
  AND token = 'PJjm8G92jQjRtlp7Xu3PukmfoCqHfyGgKOqQ6CiuTgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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