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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4275c0939890221a9d030e2e5dc9d2d2360b3229530163fbefc58af8600e7ba' 
  AND token = 'mlbftTqi/xZlxGgqDMfZ0GVkaPdgdMr7dNHT8xxc2iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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