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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13405d66a58bc9569c06b997c38a5776b305085ce2799ee3f8ade5c3177040c2' 
  AND token = '47PR7VbIQJudXJlhzXmwzet4Z0T17sf7DeXfRZkoUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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