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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2723d3e02502d9d8b54604fc8c2ce010f0230de0bd0ecf7b3d30f10f79b0e204' 
  AND token = 'sYtw1qOK5HTcOBVPj6haxDR8+EfG/K9b7Fw/VmrES94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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