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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1a9527b18ff5ee9aa71e421ac5b02ab3778c74b541fd0eb6f242a4216573e5' 
  AND token = '49AOdlhD8ind0DMrfyNQ2fLKBJLxQSxdoY4i1wtGGro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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