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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6235fd37dc5d2ec7ce4c82ce7b290a3d08e855fa84c121286cbadba58e89fdf3' 
  AND token = 'dYFfpw8jGwMwuikl/Oo/VMxLYBaqT9LV+RAtRfHt78c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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