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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9674d6e381dc6d70acb3ad7ecafe86023d1a091d387aab50d90e43d3e0589332' 
  AND token = 'tZAIvPy8wZmjHFBhm5ORsUlSggSwSYRa3VS3rgolb08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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