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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e340f743bf818855bb3508e334658a2e9809b602ec17d657a74b4045d1f3ba1' 
  AND token = 'ic61knLhVxLX4hGtuuNnMKp2/RmCCs44s7ZX0GdGors=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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