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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce520fd71357ba30702d4fcc022b4fdf723e16593ab6d5220de55aeaa0071cf' 
  AND token = '+5aW+c+fyex+SFrfd14bHqjbAl8DxJX4czakNYG1c1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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