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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb67a4cda9d2931439c698ed0a86e30125acb140aeb15e63cc4273a7c896ad' 
  AND token = 'a9si3b7nt/My0pDTsMp2KzrYysbpb1s1E3+qPk3Mic0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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