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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8d2700b56ae4c9921e67638f099004888c2ac28d0cc0bce134ace36b0a7153' 
  AND token = 'gDJB4T9G011sVIwlbH0AG1XgCEkNPcODzSWynP7HnBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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