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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cff115eda3d9397d92684b1308a3961fffb19465ea9e1de9dcd38594b2f8a26' 
  AND token = 'Q550q5TezsIPTjUocta7X7Y5qqk1oUJlwNXfGJhwWOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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