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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebca4fafebc18be7f23a4bb29c2e65963aacd547ae896a7efd9a442c7724fc6c' 
  AND token = '62Dwf58xyUYRVKTaJFH/WtFpC6KdJzbpqB0FnyBP+IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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