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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd41a8223ba089ae9a806e67ac26cc59be22d79b28e8820d6cd62624e9a9f53a' 
  AND token = '7sMxk9oYttXt1SM0Gkx/B8IF5FsRGS1ozxghyct71Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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