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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776aef6fbbb896f4c565237117c62ef05eaffce3e8029afce124c4ff2e92f6a9' 
  AND token = '7t3tnIuXxpcD3ITs8hm4ig0CF0a+e48yBDhtrwcqh/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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