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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbac6d41bc96e981e3a04232d6ce3f0053afe6c9338688706e54051ec2e29fe' 
  AND token = 'Jh61VcD+4zT5+cC9V5WlijENOrk59vcJL55ZddKoU8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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