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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bd8726707d9f8c67c05c9565c91ed167733770c33fc16d09332e87159ec5f0' 
  AND token = 'nJCm79cC7WPFSjPhjbikOwu2ChIOc8U0aVFGzegA6wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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