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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12af875a47c853791d81e6a7727cc2ae2e692e81c5250ec5c1ff4a98553332cc' 
  AND token = 'nz8jbMpx+OKVpuNrgk7hzITKE+8YYzvnO6KdYY2jtHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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