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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964e512287ff07ba13f8323905dc3bfba33ea232dc12a4171ca10ef798b27289' 
  AND token = 'VDUr6AMkArBVL6nfl9Rekmev46JJBDAqWV9ELYLY68Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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