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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e9cb8b0b8094d1e355b4d5e0db1fc84fdbbd5258497b201dabe0f3d3a420db' 
  AND token = 'CIhYdnRw/XA5b/j8/V4PXWUKgB/ZI3208fdLcmVCBUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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