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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c0019e21c741a1c1253fe40883b1eeb243776f68e115dc4e8365cd8151b72' 
  AND token = 'hDcsOPGIgE+siC7Eugnux0bLENXmkjiVrbVHSJHaFjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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