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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f2c507e4efaa9982b8e1b4c6c655ad68f2a2d01bff93769997cc8209f8de35' 
  AND token = 'G75SJOniE9Jr2L1Ggr9t7/+xNKAS6p9kdMCYp4VJ4vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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