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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d85e5014faa1156060a5f95804e0055ec5a69833c41ae05fb432f35928cbb6b' 
  AND token = '2HHVeq+SXjWYNzKIudH4Du5VFBSKvjhpwsP54E0uPSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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