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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d8f9afb4ea5ee78b77bb9303542349abdbf6cef5db79d7f5eef8e86c993816' 
  AND token = 'KcOjy+hk2r9NT/CWkKIIbIr6voPeeS5nQllpishzg98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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