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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dedd022830d076730c72fba0622256fc5478336a864168fe9ece23bea8cb61' 
  AND token = 'eX7C2aAPC9WA04CcSxVs+vixDh0FbYMrD5YlRVisIP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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