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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3df19fceb95b60865c890c50d31ac3d966e468e2217d42333b3fede49e838f9' 
  AND token = '63AahqRgH2Cg7LCr0t0VNjZmdCikwemcqYUs/RaLmZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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