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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06fea05744b07a32c3f05d6bc0f138c64faa38b47e79c5bb9064f10e9a2d62d' 
  AND token = 's4xKe0Iz+c+WXkd30fFmTiCibl3sAibPcetvEiWcJwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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