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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ea0bb2227fb596ef0ff55c400612370a36ca391dd89eef2a87b40e6f48f2ba' 
  AND token = '3B9HD0ku9Y0p8b3q1r2wl7Mv90uI2G3iXC1QGPUmHAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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